Ok so when ever i change my vents to deffrost and turn the air on it makes my truck idle higher, depending on the temperature of my truck it will severely change the idle. Any ideas or where i should start looking for a vaccum leak?

It's never done that before. It started after i went wheeling a few weeks ago and my truck was idleing at 2000 RPMs, it finally stopped idleing like that after just driving it around for a while, it didnt pull any codes either thats why i suspected it as a vaccum leak. And my truck actually idles lower when i turn AC on.

It's never done that before. It started after i went wheeling a few weeks ago and my truck was idleing at 2000 RPMs, it finally stopped idleing like that after just driving it around for a while, it didnt pull any codes either thats why i suspected it as a vaccum leak. And my truck actually idles lower when i turn AC on.

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AH! Ok then. Im not sure where to start. Have you checked to make sure all your vacuum lines are connected?